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NEET Sample Paper NEET Sample Test Paper-50

  • question_answer
    Two monochromatic light waves of amplitudes A and 2A interfering at a point, have a phase difference of \[60{}^\circ \]. The intensity at that point will be proportional to-

    A) \[3{{A}^{2}}\]                        

    B) \[5{{A}^{2}}\]

    C) \[7{{A}^{2}}~\]                     

    D) \[9{{A}^{2}}\]

    Correct Answer: B

    Solution :

    \[{{A}^{R}}=\sqrt{a_{1}^{2}\,+\,a_{2}^{2}\,+\,2{{a}_{1}}{{a}_{2}}\,\cos \phi }\,\,=\,\,5{{A}^{2}}\]


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